1 /* 2 * exportfs - Export a plan 9 name space across a network 3 */ 4 #include <u.h> 5 #include <libc.h> 6 #include <auth.h> 7 #include <fcall.h> 8 #include <libsec.h> 9 #define Extern 10 #include "exportfs.h" 11 12 #define QIDPATH ((1LL<<48)-1) 13 vlong newqid = 0; 14 15 enum { 16 Encnone, 17 Encssl, 18 Enctls, 19 }; 20 21 void (*fcalls[])(Fsrpc*) = 22 { 23 [Tversion] Xversion, 24 [Tauth] Xauth, 25 [Tflush] Xflush, 26 [Tattach] Xattach, 27 [Twalk] Xwalk, 28 [Topen] slave, 29 [Tcreate] Xcreate, 30 [Tclunk] Xclunk, 31 [Tread] slave, 32 [Twrite] slave, 33 [Tremove] Xremove, 34 [Tstat] Xstat, 35 [Twstat] Xwstat, 36 }; 37 38 /* accounting and debugging counters */ 39 int filecnt; 40 int freecnt; 41 int qidcnt; 42 int qfreecnt; 43 int ncollision; 44 45 int netfd; /* initially stdin */ 46 int srvfd = -1; 47 int nonone = 1; 48 char *filterp; 49 char *ealgs = "rc4_256 sha1"; 50 char *aanfilter = "/bin/aan"; 51 int encproto = Encnone; 52 int readonly; 53 54 static void mksecret(char *, uchar *); 55 static int localread9pmsg(int, void *, uint, ulong *); 56 static char *anstring = "tcp!*!0"; 57 58 char *netdir = "", *local = "", *remote = ""; 59 60 int filter(int, char *); 61 62 void 63 usage(void) 64 { 65 fprint(2, "usage: %s [-adnsR] [-f dbgfile] [-m msize] [-r root] " 66 "[-S srvfile] [-e 'crypt hash'] [-P exclusion-file] " 67 "[-A announce-string] [-B address]\n", argv0); 68 fatal("usage"); 69 } 70 71 static void 72 noteconn(int fd) 73 { 74 NetConnInfo *nci; 75 76 nci = getnetconninfo(nil, fd); 77 if (nci == nil) 78 return; 79 netdir = strdup(nci->dir); 80 local = strdup(nci->lsys); 81 remote = strdup(nci->rsys); 82 freenetconninfo(nci); 83 } 84 85 void 86 main(int argc, char **argv) 87 { 88 char buf[ERRMAX], ebuf[ERRMAX], *srvfdfile; 89 Fsrpc *r; 90 int doauth, n, fd; 91 char *dbfile, *srv, *na, *nsfile, *keyspec; 92 AuthInfo *ai; 93 ulong initial; 94 95 dbfile = "/tmp/exportdb"; 96 srv = nil; 97 srvfd = -1; 98 srvfdfile = nil; 99 na = nil; 100 nsfile = nil; 101 keyspec = ""; 102 doauth = 0; 103 104 ai = nil; 105 ARGBEGIN{ 106 case 'a': 107 doauth = 1; 108 break; 109 110 case 'd': 111 dbg++; 112 break; 113 114 case 'e': 115 ealgs = EARGF(usage()); 116 if(*ealgs == 0 || strcmp(ealgs, "clear") == 0) 117 ealgs = nil; 118 break; 119 120 case 'f': 121 dbfile = EARGF(usage()); 122 break; 123 124 case 'k': 125 keyspec = EARGF(usage()); 126 break; 127 128 case 'm': 129 messagesize = strtoul(EARGF(usage()), nil, 0); 130 break; 131 132 case 'n': 133 nonone = 0; 134 break; 135 136 case 'r': 137 srv = EARGF(usage()); 138 break; 139 140 case 's': 141 srv = "/"; 142 break; 143 144 case 'A': 145 anstring = EARGF(usage()); 146 break; 147 148 case 'B': 149 na = EARGF(usage()); 150 break; 151 152 case 'F': 153 /* accepted but ignored, for backwards compatibility */ 154 break; 155 156 case 'N': 157 nsfile = EARGF(usage()); 158 break; 159 160 case 'P': 161 patternfile = EARGF(usage()); 162 break; 163 164 case 'R': 165 readonly = 1; 166 break; 167 168 case 'S': 169 if(srvfdfile) 170 usage(); 171 srvfdfile = EARGF(usage()); 172 break; 173 174 default: 175 usage(); 176 }ARGEND 177 USED(argc, argv); 178 179 if(doauth){ 180 /* 181 * We use p9any so we don't have to visit this code again, with the 182 * cost that this code is incompatible with the old world, which 183 * requires p9sk2. (The two differ in who talks first, so compatibility 184 * is awkward.) 185 */ 186 ai = auth_proxy(0, auth_getkey, "proto=p9any role=server %s", keyspec); 187 if(ai == nil) 188 fatal("auth_proxy: %r"); 189 if(nonone && strcmp(ai->cuid, "none") == 0) 190 fatal("exportfs by none disallowed"); 191 if(auth_chuid(ai, nsfile) < 0) 192 fatal("auth_chuid: %r"); 193 putenv("service", "exportfs"); 194 } 195 196 if(srvfdfile){ 197 if((srvfd = open(srvfdfile, ORDWR)) < 0) 198 sysfatal("open '%s': %r", srvfdfile); 199 } 200 201 if(na){ 202 if(srv == nil) 203 sysfatal("-B requires -s"); 204 205 local = "me"; 206 remote = na; 207 if((fd = dial(netmkaddr(na, 0, "importfs"), 0, 0, 0)) < 0) 208 sysfatal("can't dial %s: %r", na); 209 210 ai = auth_proxy(fd, auth_getkey, "proto=p9any role=client %s", keyspec); 211 if(ai == nil) 212 sysfatal("%r: %s", na); 213 214 dup(fd, 0); 215 dup(fd, 1); 216 close(fd); 217 } 218 219 exclusions(); 220 221 if(dbg) { 222 n = create(dbfile, OWRITE|OTRUNC, 0666); 223 dup(n, DFD); 224 close(n); 225 } 226 227 if(srvfd >= 0 && srv){ 228 fprint(2, "exportfs: -S cannot be used with -r or -s\n"); 229 usage(); 230 } 231 232 DEBUG(DFD, "exportfs: started\n"); 233 234 rfork(RFNOTEG); 235 236 if(messagesize == 0){ 237 messagesize = iounit(netfd); 238 if(messagesize == 0) 239 messagesize = 8192+IOHDRSZ; 240 } 241 242 Workq = emallocz(sizeof(Fsrpc)*Nr_workbufs); 243 // for(i=0; i<Nr_workbufs; i++) 244 // Workq[i].buf = emallocz(messagesize); 245 fhash = emallocz(sizeof(Fid*)*FHASHSIZE); 246 247 fmtinstall('F', fcallfmt); 248 249 /* 250 * Get tree to serve from network connection, 251 * check we can get there and ack the connection 252 */ 253 if(srvfd != -1) { 254 /* do nothing */ 255 } 256 else if(srv) { 257 chdir(srv); 258 DEBUG(DFD, "invoked as server for %s", srv); 259 strncpy(buf, srv, sizeof buf); 260 } 261 else { 262 noteconn(netfd); 263 buf[0] = 0; 264 n = read(0, buf, sizeof(buf)-1); 265 if(n < 0) { 266 errstr(buf, sizeof buf); 267 fprint(0, "read(0): %s", buf); 268 DEBUG(DFD, "read(0): %s", buf); 269 exits(buf); 270 } 271 buf[n] = 0; 272 if(chdir(buf) < 0) { 273 errstr(ebuf, sizeof ebuf); 274 fprint(0, "chdir(%d:\"%s\"): %s", n, buf, ebuf); 275 DEBUG(DFD, "chdir(%d:\"%s\"): %s", n, buf, ebuf); 276 exits(ebuf); 277 } 278 } 279 280 DEBUG(DFD, "\niniting root\n"); 281 initroot(); 282 283 DEBUG(DFD, "exportfs: %s\n", buf); 284 285 if(srv == nil && srvfd == -1 && write(0, "OK", 2) != 2) 286 fatal("open ack write"); 287 288 if (readn(netfd, &initial, sizeof(ulong)) < sizeof(ulong)) 289 fatal("can't read initial string: %r\n"); 290 291 if (strncmp((char *)&initial, "impo", sizeof(ulong)) == 0) { 292 char buf[128], *p, *args[3]; 293 294 /* New import. Read import's parameters... */ 295 initial = 0; 296 297 p = buf; 298 while (p - buf < sizeof buf) { 299 if ((n = read(netfd, p, 1)) < 0) 300 fatal("can't read impo arguments: %r\n"); 301 302 if (n == 0) 303 fatal("connection closed while reading arguments\n"); 304 305 if (*p == '\n') 306 *p = '\0'; 307 if (*p++ == '\0') 308 break; 309 } 310 311 if (tokenize(buf, args, nelem(args)) != 2) 312 fatal("impo arguments invalid: impo%s...\n", buf); 313 314 if (strcmp(args[0], "aan") == 0) 315 filterp = aanfilter; 316 else if (strcmp(args[0], "nofilter") != 0) 317 fatal("import filter argument unsupported: %s\n", args[0]); 318 319 if (strcmp(args[1], "ssl") == 0) 320 encproto = Encssl; 321 else if (strcmp(args[1], "tls") == 0) 322 encproto = Enctls; 323 else if (strcmp(args[1], "clear") != 0) 324 fatal("import encryption proto unsupported: %s\n", args[1]); 325 326 if (encproto == Enctls) 327 sysfatal("%s: tls has not yet been implemented", argv[0]); 328 } 329 330 if (encproto != Encnone && ealgs && ai) { 331 uchar key[16]; 332 uchar digest[SHA1dlen]; 333 char fromclientsecret[21]; 334 char fromserversecret[21]; 335 int i; 336 337 memmove(key+4, ai->secret, ai->nsecret); 338 339 /* exchange random numbers */ 340 srand(truerand()); 341 for(i = 0; i < 4; i++) 342 key[i+12] = rand(); 343 344 if (initial) 345 fatal("Protocol botch: old import\n"); 346 if(readn(netfd, key, 4) != 4) 347 fatal("can't read key part; %r\n"); 348 349 if(write(netfd, key+12, 4) != 4) 350 fatal("can't write key part; %r\n"); 351 352 /* scramble into two secrets */ 353 sha1(key, sizeof(key), digest, nil); 354 mksecret(fromclientsecret, digest); 355 mksecret(fromserversecret, digest+10); 356 357 if (filterp) 358 netfd = filter(netfd, filterp); 359 360 switch (encproto) { 361 case Encssl: 362 netfd = pushssl(netfd, ealgs, fromserversecret, 363 fromclientsecret, nil); 364 break; 365 case Enctls: 366 default: 367 fatal("Unsupported encryption protocol\n"); 368 } 369 370 if(netfd < 0) 371 fatal("can't establish ssl connection: %r"); 372 } 373 else if (filterp) { 374 if (initial) 375 fatal("Protocol botch: don't know how to deal with this\n"); 376 netfd = filter(netfd, filterp); 377 } 378 379 /* 380 * Start serving file requests from the network 381 */ 382 for(;;) { 383 r = getsbuf(); 384 if(r == 0) 385 fatal("Out of service buffers"); 386 387 n = localread9pmsg(netfd, r->buf, messagesize, &initial); 388 if(n <= 0) 389 fatal(nil); 390 391 if(convM2S(r->buf, n, &r->work) == 0) 392 fatal("convM2S format error"); 393 394 DEBUG(DFD, "%F\n", &r->work); 395 (fcalls[r->work.type])(r); 396 } 397 } 398 399 /* 400 * WARNING: Replace this with the original version as soon as all 401 * _old_ imports have been replaced with negotiating imports. Also 402 * cpu relies on this (which needs to be fixed!) -- pb. 403 */ 404 static int 405 localread9pmsg(int fd, void *abuf, uint n, ulong *initial) 406 { 407 int m, len; 408 uchar *buf; 409 410 buf = abuf; 411 412 /* read count */ 413 assert(BIT32SZ == sizeof(ulong)); 414 if (*initial) { 415 memcpy(buf, initial, BIT32SZ); 416 *initial = 0; 417 } 418 else { 419 m = readn(fd, buf, BIT32SZ); 420 if(m != BIT32SZ){ 421 if(m < 0) 422 return -1; 423 return 0; 424 } 425 } 426 427 len = GBIT32(buf); 428 if(len <= BIT32SZ || len > n){ 429 werrstr("bad length in 9P2000 message header"); 430 return -1; 431 } 432 len -= BIT32SZ; 433 m = readn(fd, buf+BIT32SZ, len); 434 if(m < len) 435 return 0; 436 return BIT32SZ+m; 437 } 438 void 439 reply(Fcall *r, Fcall *t, char *err) 440 { 441 uchar *data; 442 int n; 443 444 t->tag = r->tag; 445 t->fid = r->fid; 446 if(err) { 447 t->type = Rerror; 448 t->ename = err; 449 } 450 else 451 t->type = r->type + 1; 452 453 DEBUG(DFD, "\t%F\n", t); 454 455 data = malloc(messagesize); /* not mallocz; no need to clear */ 456 if(data == nil) 457 fatal(Enomem); 458 n = convS2M(t, data, messagesize); 459 if(write(netfd, data, n)!=n) 460 {syslog(0, "exportfs", "short write: %r"); 461 fatal("mount write"); 462 } 463 free(data); 464 } 465 466 Fid * 467 getfid(int nr) 468 { 469 Fid *f; 470 471 for(f = fidhash(nr); f; f = f->next) 472 if(f->nr == nr) 473 return f; 474 475 return 0; 476 } 477 478 int 479 freefid(int nr) 480 { 481 Fid *f, **l; 482 char buf[128]; 483 484 l = &fidhash(nr); 485 for(f = *l; f; f = f->next) { 486 if(f->nr == nr) { 487 if(f->mid) { 488 sprint(buf, "/mnt/exportfs/%d", f->mid); 489 unmount(0, buf); 490 psmap[f->mid] = 0; 491 } 492 if(f->f) { 493 freefile(f->f); 494 f->f = nil; 495 } 496 if(f->dir){ 497 free(f->dir); 498 f->dir = nil; 499 } 500 *l = f->next; 501 f->next = fidfree; 502 fidfree = f; 503 return 1; 504 } 505 l = &f->next; 506 } 507 508 return 0; 509 } 510 511 Fid * 512 newfid(int nr) 513 { 514 Fid *new, **l; 515 int i; 516 517 l = &fidhash(nr); 518 for(new = *l; new; new = new->next) 519 if(new->nr == nr) 520 return 0; 521 522 if(fidfree == 0) { 523 fidfree = emallocz(sizeof(Fid) * Fidchunk); 524 525 for(i = 0; i < Fidchunk-1; i++) 526 fidfree[i].next = &fidfree[i+1]; 527 528 fidfree[Fidchunk-1].next = 0; 529 } 530 531 new = fidfree; 532 fidfree = new->next; 533 534 memset(new, 0, sizeof(Fid)); 535 new->next = *l; 536 *l = new; 537 new->nr = nr; 538 new->fid = -1; 539 new->mid = 0; 540 541 return new; 542 } 543 544 Fsrpc * 545 getsbuf(void) 546 { 547 static int ap; 548 int look, rounds; 549 Fsrpc *wb; 550 int small_instead_of_fast = 1; 551 552 if(small_instead_of_fast) 553 ap = 0; /* so we always start looking at the beginning and reuse buffers */ 554 555 for(rounds = 0; rounds < 10; rounds++) { 556 for(look = 0; look < Nr_workbufs; look++) { 557 if(++ap == Nr_workbufs) 558 ap = 0; 559 if(Workq[ap].busy == 0) 560 break; 561 } 562 563 if(look == Nr_workbufs){ 564 sleep(10 * rounds); 565 continue; 566 } 567 568 wb = &Workq[ap]; 569 wb->pid = 0; 570 wb->canint = 0; 571 wb->flushtag = NOTAG; 572 wb->busy = 1; 573 if(wb->buf == nil) /* allocate buffers dynamically to keep size down */ 574 wb->buf = emallocz(messagesize); 575 return wb; 576 } 577 fatal("No more work buffers"); 578 return nil; 579 } 580 581 void 582 freefile(File *f) 583 { 584 File *parent, *child; 585 586 Loop: 587 f->ref--; 588 if(f->ref > 0) 589 return; 590 freecnt++; 591 if(f->ref < 0) abort(); 592 DEBUG(DFD, "free %s\n", f->name); 593 /* delete from parent */ 594 parent = f->parent; 595 if(parent->child == f) 596 parent->child = f->childlist; 597 else{ 598 for(child=parent->child; child->childlist!=f; child=child->childlist) 599 if(child->childlist == nil) 600 fatal("bad child list"); 601 child->childlist = f->childlist; 602 } 603 freeqid(f->qidt); 604 free(f->name); 605 f->name = nil; 606 free(f); 607 f = parent; 608 if(f != nil) 609 goto Loop; 610 } 611 612 File * 613 file(File *parent, char *name) 614 { 615 Dir *dir; 616 char *path; 617 File *f; 618 619 DEBUG(DFD, "\tfile: 0x%p %s name %s\n", parent, parent->name, name); 620 621 path = makepath(parent, name); 622 if(patternfile != nil && excludefile(path)){ 623 free(path); 624 return nil; 625 } 626 dir = dirstat(path); 627 free(path); 628 if(dir == nil) 629 return nil; 630 631 for(f = parent->child; f; f = f->childlist) 632 if(strcmp(name, f->name) == 0) 633 break; 634 635 if(f == nil){ 636 f = emallocz(sizeof(File)); 637 f->name = estrdup(name); 638 639 f->parent = parent; 640 f->childlist = parent->child; 641 parent->child = f; 642 parent->ref++; 643 f->ref = 0; 644 filecnt++; 645 } 646 f->ref++; 647 f->qid.type = dir->qid.type; 648 f->qid.vers = dir->qid.vers; 649 f->qidt = uniqueqid(dir); 650 f->qid.path = f->qidt->uniqpath; 651 652 f->inval = 0; 653 654 free(dir); 655 656 return f; 657 } 658 659 void 660 initroot(void) 661 { 662 Dir *dir; 663 664 root = emallocz(sizeof(File)); 665 root->name = estrdup("."); 666 667 dir = dirstat(root->name); 668 if(dir == nil) 669 fatal("root stat"); 670 671 root->ref = 1; 672 root->qid.vers = dir->qid.vers; 673 root->qidt = uniqueqid(dir); 674 root->qid.path = root->qidt->uniqpath; 675 root->qid.type = QTDIR; 676 free(dir); 677 678 psmpt = emallocz(sizeof(File)); 679 psmpt->name = estrdup("/"); 680 681 dir = dirstat(psmpt->name); 682 if(dir == nil) 683 return; 684 685 psmpt->ref = 1; 686 psmpt->qid.vers = dir->qid.vers; 687 psmpt->qidt = uniqueqid(dir); 688 psmpt->qid.path = psmpt->qidt->uniqpath; 689 free(dir); 690 691 psmpt = file(psmpt, "mnt"); 692 if(psmpt == 0) 693 return; 694 psmpt = file(psmpt, "exportfs"); 695 } 696 697 char* 698 makepath(File *p, char *name) 699 { 700 int i, n; 701 char *c, *s, *path, *seg[256]; 702 703 seg[0] = name; 704 n = strlen(name)+2; 705 for(i = 1; i < 256 && p; i++, p = p->parent){ 706 seg[i] = p->name; 707 n += strlen(p->name)+1; 708 } 709 path = malloc(n); 710 if(path == nil) 711 fatal("out of memory"); 712 s = path; 713 714 while(i--) { 715 for(c = seg[i]; *c; c++) 716 *s++ = *c; 717 *s++ = '/'; 718 } 719 while(s[-1] == '/') 720 s--; 721 *s = '\0'; 722 723 return path; 724 } 725 726 int 727 qidhash(vlong path) 728 { 729 int h, n; 730 731 h = 0; 732 for(n=0; n<64; n+=Nqidbits){ 733 h ^= path; 734 path >>= Nqidbits; 735 } 736 return h & (Nqidtab-1); 737 } 738 739 void 740 freeqid(Qidtab *q) 741 { 742 ulong h; 743 Qidtab *l; 744 745 q->ref--; 746 if(q->ref > 0) 747 return; 748 qfreecnt++; 749 h = qidhash(q->path); 750 if(qidtab[h] == q) 751 qidtab[h] = q->next; 752 else{ 753 for(l=qidtab[h]; l->next!=q; l=l->next) 754 if(l->next == nil) 755 fatal("bad qid list"); 756 l->next = q->next; 757 } 758 free(q); 759 } 760 761 Qidtab* 762 qidlookup(Dir *d) 763 { 764 ulong h; 765 Qidtab *q; 766 767 h = qidhash(d->qid.path); 768 for(q=qidtab[h]; q!=nil; q=q->next) 769 if(q->type==d->type && q->dev==d->dev && q->path==d->qid.path) 770 return q; 771 return nil; 772 } 773 774 int 775 qidexists(vlong path) 776 { 777 int h; 778 Qidtab *q; 779 780 for(h=0; h<Nqidtab; h++) 781 for(q=qidtab[h]; q!=nil; q=q->next) 782 if(q->uniqpath == path) 783 return 1; 784 return 0; 785 } 786 787 Qidtab* 788 uniqueqid(Dir *d) 789 { 790 ulong h; 791 vlong path; 792 Qidtab *q; 793 794 q = qidlookup(d); 795 if(q != nil){ 796 q->ref++; 797 return q; 798 } 799 path = d->qid.path; 800 while(qidexists(path)){ 801 DEBUG(DFD, "collision on %s\n", d->name); 802 /* collision: find a new one */ 803 ncollision++; 804 path &= QIDPATH; 805 ++newqid; 806 if(newqid >= (1<<16)){ 807 DEBUG(DFD, "collision wraparound\n"); 808 newqid = 1; 809 } 810 path |= newqid<<48; 811 DEBUG(DFD, "assign qid %.16llux\n", path); 812 } 813 q = mallocz(sizeof(Qidtab), 1); 814 if(q == nil) 815 fatal("no memory for qid table"); 816 qidcnt++; 817 q->ref = 1; 818 q->type = d->type; 819 q->dev = d->dev; 820 q->path = d->qid.path; 821 q->uniqpath = path; 822 h = qidhash(d->qid.path); 823 q->next = qidtab[h]; 824 qidtab[h] = q; 825 return q; 826 } 827 828 void 829 fatal(char *s, ...) 830 { 831 char buf[ERRMAX]; 832 va_list arg; 833 Proc *m; 834 835 if (s) { 836 va_start(arg, s); 837 vsnprint(buf, ERRMAX, s, arg); 838 va_end(arg); 839 } 840 841 /* Clear away the slave children */ 842 for(m = Proclist; m; m = m->next) 843 postnote(PNPROC, m->pid, "kill"); 844 845 DEBUG(DFD, "%s\n", buf); 846 if (s) 847 sysfatal("%s", buf); /* caution: buf could contain '%' */ 848 else 849 exits(nil); 850 } 851 852 void* 853 emallocz(uint n) 854 { 855 void *p; 856 857 p = mallocz(n, 1); 858 if(p == nil) 859 fatal(Enomem); 860 return p; 861 } 862 863 char* 864 estrdup(char *s) 865 { 866 char *t; 867 868 t = strdup(s); 869 if(t == nil) 870 fatal(Enomem); 871 return t; 872 } 873 874 /* Network on fd1, mount driver on fd0 */ 875 int 876 filter(int fd, char *cmd) 877 { 878 int p[2], lfd, len, nb, argc; 879 char newport[128], buf[128], devdir[40], *s, *file, *argv[16]; 880 881 /* Get a free port and post it to the client. */ 882 if (announce(anstring, devdir) < 0) 883 sysfatal("filter: Cannot announce %s: %r", anstring); 884 885 snprint(buf, sizeof(buf), "%s/local", devdir); 886 buf[sizeof buf - 1] = '\0'; 887 if ((lfd = open(buf, OREAD)) < 0) 888 sysfatal("filter: Cannot open %s: %r", buf); 889 if ((len = read(lfd, newport, sizeof newport - 1)) < 0) 890 sysfatal("filter: Cannot read %s: %r", buf); 891 close(lfd); 892 newport[len] = '\0'; 893 894 if ((s = strchr(newport, '\n')) != nil) 895 *s = '\0'; 896 897 if ((nb = write(fd, newport, len)) < 0) 898 sysfatal("getport; cannot write port; %r"); 899 assert(nb == len); 900 901 argc = tokenize(cmd, argv, nelem(argv)-2); 902 if (argc == 0) 903 sysfatal("filter: empty command"); 904 argv[argc++] = buf; 905 argv[argc] = nil; 906 file = argv[0]; 907 if (s = strrchr(argv[0], '/')) 908 argv[0] = s+1; 909 910 if(pipe(p) < 0) 911 fatal("pipe"); 912 913 switch(rfork(RFNOWAIT|RFPROC|RFFDG)) { 914 case -1: 915 fatal("rfork record module"); 916 case 0: 917 if (dup(p[0], 1) < 0) 918 fatal("filter: Cannot dup to 1; %r\n"); 919 if (dup(p[0], 0) < 0) 920 fatal("filter: Cannot dup to 0; %r\n"); 921 close(p[0]); 922 close(p[1]); 923 exec(file, argv); 924 fatal("exec record module"); 925 default: 926 close(fd); 927 close(p[0]); 928 } 929 return p[1]; 930 } 931 932 static void 933 mksecret(char *t, uchar *f) 934 { 935 sprint(t, "%2.2ux%2.2ux%2.2ux%2.2ux%2.2ux%2.2ux%2.2ux%2.2ux%2.2ux%2.2ux", 936 f[0], f[1], f[2], f[3], f[4], f[5], f[6], f[7], f[8], f[9]); 937 } 938